i searched and searched, i remember something being said on how to check the CEL on the j-spec ECUs since they dont use the CEL on the cluster, i am getting some really bad MPGs lately and i know my O2s are good, not a year old yet, so i need to check it and i cant find how

i know how to do it with us-spec ecus, i just didnt know what i needed to do extra with the j-spec ones

Well that's good! Now go back a reread what I've posted, because I already answered your question it in the very first sentence. Read the posts in the first link!!!!

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Mnemonic wrote:

Note that Jspec ECU's did not come with a CEL indicator so you will no longer have a CHECK ENGINE LIGHT, i know this as i tried to get one to pop up and it never did, you can still check for codes by jumping the pins though (go figure no check engine light signal but it will still work to pull codes).

January 08 2006, 7:28 PM

papa roached

Senior Member

Joined: December 10 2002, 3:01 AMPosts: 2761Location: Montgomery, WVa

yea i did, and the second post gave me exactly what i needed without having to sort through unformated posts, jump 10 and gnd (knew that, this is only the 3rd MX-3 i have owned) and THEN jump F and B+ with a LED (check the mods, got a J-Spec KL36 ECU)

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Jspec ecus have NO Check engine light and require a LED to jump 2 other pins inorder to make a Check Engine light